This new product from Johns Manville meets 2012 IBC requirements for continuous insulation for residential buildings. It is composed of a uniform closed-cell polyisocyanurate foam bonded on each side to a foil facer—one side has a reflective foil facer and the other a non-reflective foil facer. All-Purpose Foil-Faced Polyiso Foam Sheathing is designed for easy installation where high thermal efficiency is required; it resists heat transfer with R-values up to R-22.8 (RSI-4.01).
PB Topical Ref
